A V-Series 1RU 12 Pushbutton key panel is used to increase the number of  Talk/Listen paths for a user. It has 12 talk pushbuttons and 12 listen pushbuttons. Each key has associated up/down audio level control buttons. It connects to the host panel over CAT5 up to 7m (25'). Up to 8 Extension panels can be connected to the host panel. Extension panel keys should match the host panel (Pushbutton with Pushbutton).This product is also available as Lever and Rotary extension key-panel types.